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MASTER-IAC: bright PSN in unknown galaxy

ATel #9056; E. Gorbovskoy, V. Lipunov, N. Tiurina (Lomonosov MSU), R. Rebolo Lopez, M. Serra-Ricart, G. Israelyan (IAC), V. Kornilov, P. Balanutsa, A. Kuznetsov, I. Gorbunov, V. Vladimirov, E. Popova, D. Kuvshinov (Lomonosov MSU, SAI)
on 16 May 2016; 12:47 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 9118

MASTER OT J202606.27-200732.6 discovery - bright possible SN in new galaxy?

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 20h 26m 06.27s -20d 07m 32.6s on 2016-05-16.14495 UT.
The OT unfiltered magnitude is 15.7m (limit 18.7m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2015-11-04.82983 UT with unfiltered magnitude limit 20.2m.
There is a star SDSS J202606.47-200733.0 (USNO-B1,etc) in 2.939" from MASTER OT. And there is extended object behind this star - possible host galaxy - see discovery image, so we suggest the Supernova.

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ202606.27-200732.6.jpg

MASTER Global Robotic Net